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Active 1 Bountied Hot Week Month
82 votes
273 answers
27k views

Is this even or odd?

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hakr14
  • 5,522
53 votes
84 answers
8k views

It's Hip to be Square

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sergiol
  • 4,155
51 votes
85 answers
10k views

Do n and n^3 have the same set of digits?

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sergiol
  • 4,155
29 votes
15 answers
6k views

Is it a vampire number?

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hakr14
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57 votes
142 answers
20k views

Is this number evil?

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Themoonisacheese
  • 3,197
45 votes
86 answers
7k views

Am I divisible by double the sum of my digits?

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Sandra
  • 462
11 votes
17 answers
923 views

Identify Redundant Regex

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doubleunary
  • 4,652
49 votes
100 answers
12k views

Determine if all decimal digits are unique

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sergiol
  • 4,155
84 votes
100 answers
19k views

Golf all the 16 logic gates with 2 inputs and 1 output!

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squareroot12621
  • 1,237
15 votes
17 answers
2k views

IMO 2025: Divisor sums that go forever

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138 Aspen
  • 7,257
13 votes
18 answers
2k views

Is it a product of 4 unique primes (A046386)?

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hakr14
  • 5,522
8 votes
23 answers
951 views

Can we escape from array?

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Jake
  • 121
19 votes
22 answers
4k views

I'm in your subnets, golfing your code

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l4m2
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47 votes
5 answers
960 views

Imposters at the Zoo

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